When is the best time to trek in Nepal?
There are two dependable seasons, autumn from September to November and spring from March to May. The monsoon from June to August and the deep winter are harder, and I usually steer people away from them.
Why autumn and spring
I am Lopsang, a licensed Nepal trekking guide. I have walked these trails in every season. The honest short answer is that autumn and spring give you the best chance of clear skies, safe passes and open lodges. All six treks I run share this same window, September to November and March to May. So whichever route you pick, aim for one of these two seasons. The rest of this page explains what each part of the year is really like, including the parts I would avoid.
Autumn, September to November
Autumn is the clearest season. The monsoon rains wash the dust out of the air, and from late September the mountains stand out sharp against a blue sky. October is the month I recommend most often. The trade-off is that it is also the busiest. Trails and lodges on Everest and Annapurna fill up, and you may share a dining room with dozens of people. Nights get colder as November goes on, and high up it is properly cold. Late September and November are quieter and still clear.
Spring, March to May
Spring is warmer, and that makes the high nights easier to bear. The rhododendron forests flower on the lower trails, which is a real highlight on Langtang and Annapurna. The downside is haze. As the season goes on, dust and smoke build in the air, so the views are often best in the morning and soft by afternoon. Early March can still have snow on the passes. May is warm and green but the haziest, so I would go earlier in the window if the mountains matter most to you.
Month by month
Here is how I see the year, month by month, for the six routes I sell. It is a general guide, not a promise. Weather in the mountains changes fast and no month is safe from a storm. Use it to narrow down your window, then send me your actual dates. I will tell you honestly what those weeks usually bring on your chosen route, and whether I would go, wait, or switch to a lower trek that fits the season better.
| Month | Conditions | Good for which of our routes |
|---|---|---|
| January | Deep winter, very cold high up, high passes can be closed by snow | Lower, shorter days only, such as Langtang Valley; high passes risky |
| February | Cold but starting to ease late in the month, snow still on the passes | Lower routes possible; hold off on Manaslu and Annapurna Circuit passes |
| March | Spring begins, warmer, clear early then hazier later | All six open up, including the high passes |
| April | Warm, flowers out, views good but can be hazy in the afternoon | All six, a strong month for every route |
| May | Warm and green, more haze, warm at lower altitudes | All six, best earlier in the month before the haze builds |
| June | Monsoon arrives, wet, cloudy, leeches on lower trails | Hard for all six; I usually advise waiting |
| July | Full monsoon, wet, poor views, Manaslu road can flood | Not recommended for our routes |
| August | Still wet, clearing late in the month at times | Not recommended; wait for September |
| September | Autumn begins, clearing after the rains, fresh and green | All six open, a lovely quieter start to the season |
| October | Clearest skies, best views, coldest nights building up high | All six, the peak month but also the busiest |
| November | Still clear, colder, quieter than October | All six, high passes fine early, colder later |
| December | Cold, shorter days, snow can start to close high passes | Lower routes possible; high passes become risky |
Winter, December to February
Winter is cold, dry and often very clear, and the trails are almost empty. That sounds good, and on a low route it can be. The problem is the high passes. Snow can close the Larkya La on Manaslu and the Thorong La on Annapurna Circuit, and a closed pass can end a trek. Many high lodges shut for the season. Days are short and nights at altitude are bitter. If winter is your only free time, tell me and we will pick a lower route that still works, such as Langtang Valley.
Monsoon, June to August
The monsoon is the hardest season. It is wet most days, cloud hides the mountains, and leeches come out on the lower trails. Landslides can block roads. The Manaslu road in particular can flood, which makes even getting to the start a problem. Flights to Lukla are often cancelled. Some rain shadow areas stay drier, but none of the six routes I sell sit fully in one. I would not put a first timer into the monsoon. If you can only come then, we should talk about a different plan.
Crowds and the quieter weeks
One more honest point on crowds. In October the popular trails and lodges fill up fast. On Everest Base Camp and Annapurna, that means shared dining rooms and beds booked ahead. If crowds put you off, the quieter treks like Manaslu and Langtang feel calmer even in peak weeks. The shoulder weeks in late September and in November thin the numbers out, and so does early March. Tell me how you feel about company on the trail and I will steer you to the right week, not just the right month.
Book the season, then the week
Once you have picked autumn or spring, the next choice is the week. Flights and lodges in the peak weeks book up early, so the sooner you tell me your dates the more choice we both have. If your dates are fixed by work or family, I will be straight with you about what the weather usually does in that window and whether your chosen route fits. There is no perfect month for everyone, only the best fit for your dates, your fitness and how much company you want on the trail.
What I'd suggest
If clear mountains matter most, I would choose October or November and accept the crowds. If you prefer warmer days and flowers, go in March or April. Keep the high passes on Manaslu and Annapurna Circuit inside those two windows. Send me your dates and I will help you land on the right week.